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                攻略                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div style="text-indent: 24pt"><span style="font-size: medium">题目简述：树版[k取方格数]</span></div>
<div style="text-indent: 24pt"><span style="font-size: medium">&nbsp;</span></div>
<div style="text-indent: 24pt"><span style="font-size: medium">众所周知，桂木桂马是攻略之神，开启攻略之神模式后，他可以同时攻略k部游戏。</span></div>
<div style="text-indent: 24pt"><span style="font-size: medium">今天他得到了一款新游戏《XX半岛》，这款游戏有n个场景(scene)，某些场景可以通过不同的选择支到达其他场景。所有场景和选择支构成树状结构：开始游戏时在根节点（共通线），叶子节点为结局。每个场景有一个价值，现在桂马开启攻略之神模式，同时攻略k次该游戏，问他观赏到的场景的价值和最大是多少（同一场景观看多次是不能重复得到价值的）</span></div>
<div style="text-indent: 24pt"><span style="font-size: medium">&ldquo;为什么你还没玩就知道每个场景的价值呢？&rdquo;</span></div>
<div style="text-indent: 24pt"><span style="font-size: medium">&ldquo;我已经看到结局了。&rdquo;</span></div></p><hr/><h3>输入格式</h3><p><div style="text-indent: 21pt"><span style="font-size: medium">第一行两个正整数n,k</span></div>
<div style="text-indent: 21pt"><span style="font-size: medium">第二行n个正整数，表示每个场景的价值</span></div>
<div style="text-indent: 21pt"><span style="font-size: medium">以下n-1行,每行2个整数a,b，表示a场景有个选择支通向b场景（即a是b的父亲）</span></div>
<div style="text-indent: 21pt"><span style="font-size: medium">保证场景1为根节点</span></div></p><hr/><h3>输出格式</h3><p><div>&nbsp;</div>
<div style="text-indent: 21pt"><span style="font-size: medium">输出一个整数表示答案</span></div></p><hr/><h3>样例输入</h3><pre>5 2
4 3 2 1 1
1 2
1 5
2 3
2 4
</pre><hr/><h3>样例输出</h3><pre>10</pre><hr/><h3>提示</h3><p><p><span style="font-size: medium">对于100%的数据，n&lt;=200000，1&lt;=场景价值&lt;=2^31-1</span></p></p><hr/><h3>题目来源</h3><p>dfs序+线段树</p>
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